In the lab, researchers measure willpower based on people's persistence with a given task -- be it solving a puzzle or abstaining from a chocolaty delight. Beyond this method, there's no universal measurement for human will.
Individual levels of willpower fluctuate throughout the day depending on diet, activities and other factors. Still, some folks experience a definite advantage. Roy Baumeister contends that there's likely some genetic component to human willpower, as self-disciplined parents tend to have self-disciplined children, but upbringing undoubtedly plays a strong role here as well [source: Economic Times].
This is where the marshmallows enter the picture. During the late '60s, the Stanford Marshmallow Experiment placed children ages 4-6 one at a time at a table in front of a tempting marshmallow. They were free to eat the alluring sugar puff, but there was a catch: If they resisted eating the marshmallow for a whole 15 minutes, they'd earn a second marshmallow.
As you might expect, most of the children broke after less than three minutes. The marshmallow was simply irresistible. Yet some of the children held out the entire 15 minutes, and these children went on to snag SAT scores 210 points higher than their sugar-happy counterparts [source: Lehrer]. The marshmallow gobblers, on the other hand, struggled with stress, relationships and attention as adults [source: Lehrer].
Since 1968, researchers have conducted various takes on the marshmallow test. For instance, a 2012 version from the University of Rochester primed the children to feel they were in ether an unreliable or reliable situation before the marshmallow test. Half the kids experienced a broken promise from a tester regarding additional art supplies, while the other half actually received them. When it came time for marshmallows, the rewarded children held out four times as long than the spurned children on eating the treat [source: Severns].
A new riff on the marshmallow test suggests kids will wait longer — on average twice as long — for that second marshmallow if they have good reason to believe that it will actually come.
So what are we to make of willpower? Some of us possess more than others, but it's a finite commodity. We can press on through ego depletion fatigue and believe ourselves inexhaustible. We can boost ourselves with sugary snacks. We can make deals with ourselves concerning long-term rewards. Or we can even threaten ourselves with punishments for failure, lashings ourselves to the figurative mast in what we call a Ulysses pact.
In the end, however, it's just you and the thing you simultaneously desire and loathe. So set obtainable goals. Remain conscious of limited willpower reserves, yet don't fall back on it as an excuse for caving.
But if all else false, just remember the words of Oscar Wilde:
"The only way to get rid of a temptation is to yield to it."